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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be40eeed2d31fabc8c6d918b88b19d11a1934593cdb77ecdc6d3ca942c30bd9' 
  AND token = 'zJr5Iy6cuGcZHjqpv0hEDi2epWeocff99I/01PIZVZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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