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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b25107f2a38e77268a0fcbcf72a1c93dcbfb947cfc91fb29a93eac4c77c0729' 
  AND token = 'v/y4ZjObajeuH1As1TisK5P6HFqfOwqe/zWFqZRjQCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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