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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e83bb3e667c776af4190e959a35e7b3b1bedaaf1f30af62c7f81321c66eaab' 
  AND token = '3v43drmRs1VxSkqzTXy9psUGMaS/FMZkxLB8KMuXTV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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