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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85bae8ad972137904f9f90c68ce12ef92bdcbf5fbc6a0d193349bc25bb0f6485' 
  AND token = '0uZUAT1sxl6viDsTa9t3HBrY0NEAUC0xJObQLtPm+Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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