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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0c6a28b876a4225dbc4b7bd019b68a340c98ca2f762e31ace4a977824cfd55' 
  AND token = '93s8N2dwiEaeUOYsf5v6fuvVDF4fu16BTILTjiH7Fyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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