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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b30a94c55ae38ac16fad575d2df4c15e4449a6545c0e19160065e17c41e2c3' 
  AND token = 'YXfqLbXm8o/DSa2jvR0My3WlBY0Ka6ptdsJvjrxcxO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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