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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c745e65f0dbf9767e8d318c7adefc1037415620715d2f96613349e3a40a1ebeb' 
  AND token = 'EUOaIuzwyChD8oE1X75kVk5JnIhP1Vw+3vuKob8+4rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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