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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb878b9c8506d4f1c29eb68d18caafdc41213cf8c9ed749d3a6b39ece62279dc' 
  AND token = 'vD6s6jYTQKdDo0qp2rwjs3Ji7QExtn3iw582ErL9CTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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