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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75abd8ca9a1c162565d737c3878792d416e260df8a513a163689f1e2d5743257' 
  AND token = 'cUxDkrNX2+OHrpXCMmudKQBaHn5gx4hd7chaW+yX400=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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