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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f019c921811d27ae490acbd4e69a3bc1bd5dee56cf88bbd22910844e186981' 
  AND token = '9JvBO6bb9VPcdo/TmS2kwgZ/c40s/BxhTNquWk2g1aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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