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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca313b697cb6da3f0b5a17e681f14b368d6a3e8fd6cf414253a141a5d900d97e' 
  AND token = 'ieUQqOAvY1F18xzbXUdRp05rA5LqoSoam/SzrjRkxM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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