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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05503cd0b2af1bb11df34876f20b9757389c14067638a224ec014c1979f427cc' 
  AND token = 'zCOOmFqJMtKQJaTtXnqhTaSNYp+nivDhckNlcE2rbys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}