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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '678ac474c6b92af9feaaf6f6dc1785686a45d3750eb13e042dd8798b9962af0c' 
  AND token = 'bu25cmA8OU+U1A6Bv3QmS2kI0gQfrIJ9eeeR3EQFZrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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