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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc53c01ae8a4d9f50382e3fcbbccf364def05aeeca5b406b0fd0e48ae16ad8b2' 
  AND token = 'h1Ncc/c33P25yeODjv/v/Rh+xygFaFQZYs3EiI34p30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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