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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79e19f24e5ee53f3d49972bb490e589c13feca25e5d6b4b5b7a8ac404797e00' 
  AND token = '6Od8kAXXOlM5NPkXcy/OE093ShzgA6R58p9jBWrUIbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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