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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28876d5440306c9d62bea049ea4b1677fd730c68e2ad2f833dfcd956e2c3962c' 
  AND token = 'TsGd13cBviwlYSFk+39jOcHf/RIW3ne6NrDA3sKcQwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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