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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6124b15f63cda244429a14ef97bd64b5378545c4decccf502f76494fe17fe3a2' 
  AND token = 'vO05+2VJIS+9ItkD4uDqwZt5CBvrQycjHekATMUpveY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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