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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31415768a6a26ef8bdfb85afd45bc435ae005f2228b87e4abce2a0d56c06b5a' 
  AND token = 'iq6uOXpl2gR6ujNiO6aJro3iiqWrzD743t8WQLrVdtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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