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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e7f2cdaee177d6e124a7f67db3bc9039d1a09a11867f7d9bab597132eefb82' 
  AND token = 'eu/c8yJHpcu2FLKp/iVSjk5+Lm3x7hnyCTpZD9eh14g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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