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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9902da07e49da2bc7fbca569b5a1b144dab037ce600f666af1b2fa8157072a7' 
  AND token = 's/rpBNexLvqTkQoRXdL8YYGsdj276PLCZsXd3VCkPdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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