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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e116a01164b7a967472e697218f4d1ce5eb1da958827a117121562da63f967' 
  AND token = 'OgYtGB4DA0R06gXozHDgb8/Y+9viGLYeMsJO5ZFakUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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