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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e851c055c7af29e51c0864f106ef330c7ef9d172ab72bd00fbf297753305fed4' 
  AND token = 'c1r1liZu6tN1Fq9Zj5PcmcRCq8/R23ci5Dgy2CF3x/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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