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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6811a2cb47235b78894e9a7167a1ec28da4b02aaa0202f702b45fe79732d6d81' 
  AND token = 'FYPhRKqTRp2wF1QMXG5d2O7Y9ck7payg+EyQnV80QYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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