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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eefd9adc1321826ae17b457a2ebff0402a0b0d721c1c7d3e588879117e80dcb3' 
  AND token = 'FDS/yC5rHOM41WOpbdHt5GDEmOJ/cWs3b/bVUnojcJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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