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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed003b7b8469d3f32d251d1548fb4478554007a3b9c1490a26c572a0e6821a3d' 
  AND token = '584T4Od+bX4u/pAlYetpyewK5ah3x76fHp/cs+q7e1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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