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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d171c1144b633850d8510201b53db33ba3a62d00c9475a2b8a3a3306f94c94' 
  AND token = '7k+x35aD2gEIPNilv9/F1r8e2MdJ0DsdQPJjWcLGGL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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