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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c569ab1b10620e00bb0503eb3a39d7b22ec4976650adb2f1d7029c0edd5ef4' 
  AND token = 'OT7zjzfia0Mj+rj3rnctAv3p/8WM2v0T1Pgjrl975Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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