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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14f2324a09180d342f97b912c9c20e1261265b077bfa8c5d29fb345d20d8b29' 
  AND token = 'S2aQz1x0rcTaJ2BkS3hKac4jJAIqn2JLmpefsEFP1jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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