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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07cb5d37c7e4f3a7c024821935181f9f779328c624e1e8adc0f20abe15a972e8' 
  AND token = 'F2JUFQix0fuoeMQZiEnfJnRooyeRkBOYLw6gN7tNybI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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