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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922daba6c95afe6b320b7c09a86fb36c7e50d517eaf836b6523d9c23ecaf0de8' 
  AND token = 'Elqsk5Z9c/KGLyv8Unb0oofUa7L0HgM8WrzOmz3+jBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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