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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523b79045be1c678e5da4ac0fcb39a3de8e12928b1cc6e037abcb6dbed784c22' 
  AND token = 'zzrW3N7hL4MOWVhdBRt3aUH4OdsHegikmKdeizvncE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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