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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e697324c2003556d3ec028a9bc00b1a03b5b08d7fd29bbfd53f14c1af1e315' 
  AND token = 'd2pOy068Io/7NP2h1wVqaktoKyTTo7PTw46vLA3lm+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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