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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2552087e461daa8cc86faaf92e2d854ce2e9e5a632610f085f16ab5693f790' 
  AND token = 'uHFPvxDXmco2Denz8ST9r/KDGUjBWmlTsAxnFuALfTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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