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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4e9d2e1794e2f04c1ed5ac84c5b8e4938b4a0b1a830ed90898646c90613ccfc' 
  AND token = 'lxjN/ZDlV2RWSfe1Fp+mnJPMEMYCrLQi7ejd6v3AXRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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