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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b7d9bcb2f55aba966de3176e35ad83f7dfe131e398165157d5e9ced83b9332' 
  AND token = '0jpaefDq+hIyz7IH3QwuEP/M/2RmAAMSTJeV+GHzLpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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