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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '484fe1b4f5127c72d2cd7e24c0252edd3ab2026e06c02f2bdb590d35a6b58984' 
  AND token = 'c4DGemBpPmElrwmi6zelDHDZMxYmY9ikETvVJgx13Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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