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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770c3cd1a42451ea4c1d00b3ec4bbfd10e2047699535c2baf39a870cdd97bfba' 
  AND token = 'VfIb4z+4Ls8x/OpX2YumgLDrqLGNxbA6ID+rBlFuSrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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