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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb7843baf255f64df6955a5428a2da619f39899058e8d6514c0b1891a33836b' 
  AND token = 'gHi8veEX+CtAWL2CUkTRaRPNEOSkReZ+DQFOXlLzilU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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