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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f42edac35bb5fba6bcde5c64fc22fc66d89961a0b22fdc50c17ece6cdb5bb9af' 
  AND token = 'eDD7J8Pl5hT6xpMTdah2LISEdH9mbF5ryK40PuF3rJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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