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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0470ccc8f5c5a044010e19cbcafa304ebfa1f0a72de0b659721f9d9feee20a5' 
  AND token = '3JG1P1wsjZEzXAPDplEyBwR71NFf7x9+R3MOwSHNFWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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