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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c7575c5890d06c26099e271086dcd7ea54833141d3f1d34287ad112017a64b' 
  AND token = 'fRtZpyDqoicHPt9uzQ9z2e4AD21Ly6ayz+ABNV2vR/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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