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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e5cf21b46fad44a2ee2209e6e2c4c391a87051df7c0786c9de33db3a75477f' 
  AND token = 'V4AraCGthZdQ6GY95g4pOQRB8QX6MT3/IOF4cpFV/io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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