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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c09d4c7903ee91fc68b9fc0a188f005281bdcb0f0fbb7a0db4748134f626619' 
  AND token = 'eHNp7W4NvJjjm60TO6F9sOsJMazbzkECpWQdJA4ErAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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