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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c2724094a0b74adc8a400d854c470b5b37e4323dd775c85da2a474df87ae252' 
  AND token = 't7tjzG/mpx5b/jI7Sk84xMOtKp4szexS9wvMAgLEeWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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